Gurjeet Singh <singh.gurj...@gmail.com> writes:
> On Wed, Jun 15, 2011 at 10:31 AM, Robert Haas <robertmh...@gmail.com> wrote:
>> Well, that would probably be a lot slower, and wouldn't necessarily
>> deliver as consistent a snapshot of system activity. It's better to
>> have one set-returning function that dumps out all the data in a
>> single pass.
> I wanted to address consistency issue in the previous mail, but then wanted
> that to be left for later.
> We can provide consistency the same way pg_locks provides; take a snapshot
> on first request within a transaction, and reuse that snapshot for
> subsequent calls. In this case we might want to go a bit finer grained by
> providing a snapshot for every query.
Quite honestly, the implementation mechanism used by the other
statistics views is enormous overkill. I agree with Robert that I'm not
eager to duplicate that for the activity view, when a simple SRF can get
the job done.
regards, tom lane
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